Bobbin with tail-tie



March 1957 J. WALE EI'AL BOBBIN WITH TAIL-TIE Filed Jan. 30, 1953 BOBBINWITH TAIL-TIE John Wale and Alexander G. Edgington, Coventry, England,assignors to Courtaulds Limited, London, England, a British companyApplication January 30, 1953, Serial No. 334,284

Claims. (Cl. 242-125) culties are increased when it is desired to securethe leading end of the thread to the bobbin, separate from the mainwinding, to form a tail. It is known to use an air suction tube to takeup a travelling thread during threading-up operations. For example, inUnited States of America Patent No. 2,485,776, a bobbin mounted on atwisting machine has a chamber within the bore which is connected with avacuum pump through a hollow spindle. The base of the chamber is fittedwith a screen so that a travelling thread led to the chamber is drawn inand retained within the chamber. When the bobbin is rotated, theoperator leads the thread into an external groove on the upper part ofthe bobbin for the purpose of winding a tail and then leads the threadon to the barrel of the bobbin for the normal winding operation.

The object of the present invention is to facilitate securing a tail toa bobbin.

According to the present invention, a bobbin has a thread trap withinthe bore for the purpose of securing a tail, the thread trap beingcapable of catching and holding a thread passing through the bore whenthe bobbin is rotated at the commencement of a winding operation.

In a preferred form of the invention, the thread trap comprises ahorizontal spring strip secured at one end to the wall of the bore ofthe bobbin, the other end curving inwards towards the axis of the boreto form a guiding surface to the nip between the strip and the wall ofthe bore.

In an alternative form of the invention, the thread trap comprises aspiral spring or a spring ring which is mounted in an annular groovewithin the bore of the bobbin and is held in the groove by the outwardpressure of the spring. The inner end of the spring forms a guidingsurface to the nip between the spring and the wall of the bore of thebobbin.

In one method of securing a tail to the bobbin containing spring stripsaccording to the invention, the bobbin is mounted on a ring spindlehaving a suction tube passing up the bore of the bobbin to a point belowthe thread trap. A travelling thread is fed into the suction tube, andis then threaded into the traveller on the ring. The upper edge of thesuction tube is fitted with a cutting edge which is capable of severingthe thread when the thread is drawn into contact with it. When thebobbin is rotated, the thread passing from the traveller to the bobbinis directed on to the barrel of the bobbin and nited States Patent Owingto the speed at which thread is dea 2,783,954 Patented Mar. 5,

winding proceeds in the normal maner. The thread passing down the boreof the bobbin is caught by the free end of the spring strip and isguided by the strip into the nip between the strip and the wall of thebore, where it is held. The thread in the bore is now brought intocontact with the cutting edge on the suction tube where it is severedleaving a tail secured by the thread trap.

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Specific examples of bobbins constructed in-accordance with the presentinvention are illustrated in the accompanying drawings, in which- Figure1 is a front elevation partly in section, showing a bobbin mounted on aring-spindle prior to winding a thread on the bobbin, 1 1 1 Figure 2 isa perspective view on a larger scale of the end of the suction tubeshown in Figure l,

Figure-3 is a fragmentary view, on a larger scale, of Figure 1 whenwinding has just commenced,

Figure 4 is a plan view of Figure 3,

Figure 5 is a fragmentary front elevation in section of a further formof bobbinin accordance with the invention, and

Figure 6 is a plan view of Figure 5. v

In Figure 1, a bobbin 1 is mounted on a platform 2, rotatable by aspindle motor 3, of a ring spindle indicated generally at 4. The motor 3is mounted on a traverse rail 5, and a tube 6 passes centrally throughthe motor 3, the platform 2 and part of the way-up the bore 7 of thebobbin 1. The tube 6 is connected to an'air suction apparatus (notshown) and traverses with the rail 5. Within the bore 7, a horizontalspring strip 12 is secured at one end by a screw 13 to the wall of thebore 7, between the top of the bobbin 1 and the top of the tube 6. Theother end of the strip 12 curves away from the wall of the bore 7towards the axis of the bore 7.

The end of the tube 6, as shown in Figure 2, is provided with a serratedthread cutting edge 14 extending over about half the circumference ofthe tube 6. The remaining half of the circumference of the tube 6, shownat 15, is smooth.

To set up a travelling thread 8 passing downwards from a drying reel ofa continuous spinning machine (not shown) through a guide 9, the thread8 is led by hand into the bore 7 of the stationary bobbin 1 where it isdrawn into the tube 6. vThe thread 8 is then looped through a traveller10 on a fixed ring 11 as shown.

The bobbin 1 is now rotated to begin the winding operation and thethread 8 passing between the traveller 10 and the bobbin 1 is caused towind on the bobbin 1 in the normal manner as is shown in Figure 3 sothat the looped thread is overwound by winding 16. Simultaneously, thethread 8 in the bore 7 is caught in the nip 17 between the strip 12 andthe wall of the bore 7, the thread 8 being guided into the nip by thecurved strip 12 by virtue of the dllCCtlOll of rotation of the bobbin 1(shown by an arrow in Figure 4). The thread 8 is securely trapped by thenip 17 and is also brought into contact with the cutting edge 14 of thetube 6 so that after several revolutions of the bobbin 1, the thread 8is severed at the point where it enters the tube 6.

Winding the thread on to the bobbin 1 proceeds until the bobbin is fullwhen it is stopped and the full bobbin replaced by an empty bobbin. Thethread 8 secured within the nip 17 constitutes a tail and may be used inthe known manner for joining up to another bobbin dur ing an unwindingoperation. Setting up of the fresh bobbin is then efi'ected as describedabove.

A further form of bobbin is shown in Figures 5 and 6 where the strip 12is replaced by a spring ring 18 which fits into an annular groove 19 inthe bore 7 of the bobbin 1 and is retained in this position by theoutward pressure of the spring 18.

The spring :18 has an inner end 20 which curves towards the axis ofthe-bore 7 and acts in-the same manner as the strip 12 in catching andguiding the thread 8 lnto a nip 21 between the spring 18 and the wall ofthe bore '7 when the bobbin is rotated inthe direction of the arrow,as'shown in Figure 6.

The end 20 of the spring 18 is preferably tilted in 'the'upwarddirection so as to facilitate the catching of the thread 8.

Whatwe claim is:

1. A bobbin for the collection ofthreads comprising a cylindrical barrelupon the outer surface of which the threads are wound, there being acylindrical bore passing longitudinally through the center of-the;barrel, and a curved member totally enclosedwithin the bore, oneend of the "curved member being held associated with :the wall of theborewhile a remaining part of the member curves away from the walltoward the axis of the bore in'such manner that a nip is defined betweenthe member and the wall at a point intermediate the ends of the bore and20 in a direction'adapted to catch and 'hold as a tail a thread passingthrough the bore when the bobbin is rotated for Winding at thecommencement of winding.

2. Abobbin-according to claim 1 in which the curved member is at such alevel inside thebore and below the top thereof that when the bobbin ismounted on a ring spindle having asuction tube passing up the bore ofthe bobbin with cutting means on the upper edge of the tube, the curvedmember is adapted to hold the thread in contact with the cutting means.

3. A bobbin-as claimed in claim 1 wherein the end of the curved memberwhich curves from the-wall of the bore is also tilted upwardly tofacilitate catching the I thread.

4. A bobbin for the collection of threads comprising a cylindricalbarrel upon the outer surface .of which the threads are wound, acylindrical bore passing longitudinally through the centre of the barreland a spring strip located within the bore, one end of the spring stripbeing secured to the wall of the bore and the other end of the springstrip curving from the wall of the bore towards the axis of the bore sodefining a nip between the spring and the wall of the bore for thepurpose of catching and holdingas a tail, a thread passing through thebore when the bobbin is rotated at the commencement of a windingoperation.

5. A bobbin for the collection of threads comprising a cylindricalbarrel upon the outer surface of which the threads are wound, acylindrical bore passing longitudinally through the centre of the barreland a spring ring located in an annular groove within the wall of thebore, one end of the spring ring being held against the wall of the hereby outward pressure of the spring ring and the other end of the springring curving from -the wall of the bore'towards the axis of the-bore sodefininga nip between thespring and the wall of the bore forthe purposeof catching and holding as atail; a thread'passing through the bore whenthe bobbin is rotated-at the commencement of a winding operation.

References Cited in the file of this patent UNITED'STATES PATENTS808,-114 Rowley et al., Dec. 26, 1905 1,136,305 Andrews Apr. 20, 19152,635,831 Hays Apr. 21, 1953

